Refrigeration equipment Pozis is deservedly popular in the post-Soviet space due to its reliability and maintainability. However, even the highest quality equipment breaks down over time, requiring the intervention of a specialist or self-repair. The owner often encounters a situation where the unit stops freezing, begins to make strange sounds, or an ice crust freezes over. Understanding the basic principles of operation and the ability to carry out initial diagnostics will help save significant money on calling a specialist.
Before starting disassembly, you must clearly understand the risks. Electric current poses a real threat to life, therefore any manipulations with the electrical part are carried out only after disconnecting the device from the network. In this article we will look at the most common breakdowns typical of models Pozis RK-139, Pozis RK-102 and other serial numbers. You will learn to identify a faulty unit by indirect signs and understand when repairs are possible with your own hands, and when it is better to contact the service.
Statistics show that more than 60% of refrigerator breakdowns are associated with violation of operating rules or natural wear and tear of consumables. The most vulnerable element in older models is the door sealing rubber, the loss of elasticity of which leads to constant operation of the compressor. Competent approach diagnostics will allow you to avoid replacing expensive components such as a compressor or electronic control module. Let's look at the main stages of finding and eliminating defects.
⚠️ Attention: Before starting any work on disassembling the refrigerator, be sure to disconnect it from the power supply and wait for the chambers to defrost for at least 12 hours, if any diagnostics of operation when the unit is turned on.
Primary diagnostics and error codes
Modern models of refrigerators Pozis are equipped with a self-diagnosis system that displays information about malfunctions on the display or is signaled by flashing indicators. If you see a flashing light or hear an intermittent beep, this is the first step to solving the problem. Old models lack electronics, so diagnostics there are carried out by exclusion and listening to the operation of components.
First, you need to analyze the nature of the malfunction. The refrigerator may not turn on at all, work continuously without gaining temperature, or, conversely, freeze food. Thermoregulator and temperature sensors often become the culprits of incorrect operation. If the compressor hums but does not start, the problem may lie in the start relay or the motor itself.
It is important to pay attention to how the motor-compressor behaves when turned on. A short beep and a click indicate an attempt to start, which is blocked by protection. Continued operation without shutting down indicates a refrigerant leak or loss of compressor performance. In models with No Frost a frequent problem is a malfunction of the defrost system.
Faults in the defrosting system and freezing of ice
One of the most common problems in refrigerators Pozis, especially in models with the system No Frostformation of an ice coat in the chamber or on the back wall. This is due to a malfunction in the defrost cycle. The system consists of a heater (heating element), a defrost sensor and a timer or electronic module that controls the process. If any of these elements fails, the evaporator becomes overgrown with ice, blocking air circulation.
To check the defrost heating element, you need to get to the evaporator by removing the back panel in the freezer. Multimeter in the dialing mode it will show the integrity of the heater coil. The absence of resistance indicates that the heating element is burnt out, which requires its replacement. Also, the defrost sensor often fails, which should open the circuit when a certain temperature is reached.
☑️ Diagnostics of the No Frost system
If the air circulation fan does not work, cold does not enter the main chamber, although everything in the freezer is frozen. The fan blades may become blocked by ice or the motor itself may burn out. When disassembling, be careful with the plastic latches of the panels, they become fragile in the cold.
⚠️ Attention: Technical characteristics of heating elements and sensors may vary depending on the specific modification of the refrigerator. Always check the part markings with the catalog number of your model before purchasing spare parts.
Problems with the thermostat and temperature sensors
Thermostat (temperature regulator) is a mechanical or electronic device that turns the compressor on and off depending on the temperature in the chamber. Older models Pozis use a capillary thermostat, the sensitive tube of which is inserted into the evaporator. If the refrigerator does not turn on at all or works without stopping, check this unit first.
To diagnose a mechanical thermostat, you can close its contacts directly. If after this the compressor starts working, then the regulator is faulty and requires replacement. In electronic models, this function is responsible thermistors. Their resistance changes depending on temperature, and the control module reads these readings. A discrepancy between the actual resistance and the nominal value indicates a malfunction of the sensor.
How to check the thermostat without instruments?
Dip the sensitive tube of the thermostat into cold water with ice. After a few minutes, you should hear a click that opens the contacts. If there is no click, the part is faulty.
Replacing the thermostat is a simple procedure, but requires care. The sensitive tube of the new regulator must be installed in exactly the same place where the old one was, otherwise the temperature regime will be disrupted. Incorrect installation leads to short operating cycles or long downtime of the unit.
Diagnostics and replacement of the starting relay
The starting relay is responsible for starting the compressor engine and protecting it from overloads. This is one of the most frequently replaced parts in refrigerators Pozis. The symptoms of a relay malfunction are classic: you hear a click, the motor hums for 2-5 seconds, then clicks again and turns off. Thermal protection is triggered, preventing the compressor from completely burning out.
Relays come in different types: posistor, induction and combined. The selection of an analogue is carried out strictly according to the markings applied to the body of the old relay or according to the compatibility table. Installing an unsuitable relay can lead to compressor wedge or burnout of the windings. Before replacing, make sure that the compressor itself is not jammed.
The replacement process takes a few minutes. It is necessary to remove the relay from the compressor contacts, disconnect the wires and install the new device in the same orientation as the old one (usually indicated by an arrow UP). The contacts must be clean and fit tightly to the motor terminals.
Eliminating freon leaks and replacing the filter drier
If the compressor runs constantly, but there is no cold, and the condenser (grid at the back) remains only partially cold or warm, there is a high probability of a refrigerant leak. In refrigerators Pozis the foamed evaporator or the soldered joints of the tubes often suffer. It is impossible to find and seal a leak on your own without professional equipment.
However, if you have the skills to work with refrigeration equipment, repairs are possible. It includes searching for nitrogen leaks, eliminating the fistula, evacuating the system, replacing filter-drier and refilling with freon. The filter-drier must be changed whenever the circuit is opened, since it is disposable and absorbs moisture from the air.
| Refrigerant type | Suction pressure | Current compressor | Filling weight (g) |
|---|---|---|---|
| R134a | 0.6 - 0.8 bar | 0.6 - 0.9 A | 130 - 150 |
| R600a (Isobutane) | 0.4 - 0.6 bar | 0.4 - 0.7 A | 50 - 70 |
| R12 (old models) | 0.8 - 1.0 bar | 0.7 - 1.0 A | 140 - 160 |
Replacing a compressor: when necessary
Replacing a compressor is the most expensive and complex type of repair. They resort to it when the engine burns out (interturn short circuit) or a mechanical wedge. You can check the windings with a multimeter: the resistance between the starting and operating windings, as well as between them and the housing, must correspond to the passport data. A short to the housing (resistance 0 Ohm) is a sign of breakdown.
When replacing a compressor in Pozis it is important to select a unit with similar performance and type of refrigerant. Using a more powerful motor will result in the system not having time to release heat, and the refrigerator will work under overload. A less powerful motor will not provide the required temperature.
After installing a new motor, the system must be thoroughly vacuumed for 15-20 minutes to remove moisture and air. Residual moisture in the system is the main reason for the formation of ice plugs in the capillary tube and failure of the new compressor. High-quality soldering of seams is also critical for the durability of the repair.
⚠️ Attention: Working with refrigerants requires a license and special equipment. Isobutane (R600a), used in many modern models, is explosive when concentrated in air. Do not solder if there is gas in the circuit.
Frequently asked questions about repairs (FAQ)
Why does the Pozis refrigerator hum more than usual?
Increased noise can be caused by several reasons: vibration of the case due to improper installation (check the legs), fan malfunction in the No Frost system (a piece of ice or wear on the bearing), or the beginning of destruction of the compressor suspension. A rattling tube touching the body may also hum.
How to defrost a Pozis refrigerator correctly?
You must unplug the appliance, remove all food and leave the doors open. It is strictly forbidden to speed up the process with a hairdryer or knife - this can damage the evaporator. Natural defrosting takes about 12-24 hours. The water collection tray should be emptied as it fills.
What to do if a puddle has formed at the bottom of the refrigerator?
Most often this indicates a clogged drainage hole. Water from melted snow does not go into the evaporation tank, but overflows over the edge of the groove and flows onto the floor. You can clean the hole with a soft wire or a special brush, pouring a little warm water in there.
Is it possible to replace a mechanical thermostat with an electronic one?
Theoretically, it is possible, but this requires a deep rework of the control system and the selection of a compatible module. Factory equipment Pozis usually involves the use of standard mechanical regulators, which are more reliable and cheaper to maintain. Direct replacement without changing the circuit is not possible.